How do you change the signal light bulb on a 1990 Cadillac DeVille?

To change the signal light bulb on a 1990 Cadillac DeVille, first, open the hood and locate the light assembly. Disconnect the electrical connector by pressing the tab and pulling it out. Remove the bulb socket by turning it counterclockwise, then pull out the old bulb and replace it with a new one. Reinsert the socket, reconnect the electrical connector, and test the signal light to ensure it’s working properly.